Audio in rendered mp4 plays a microsecond behind on one machine, accurately on another, and ahead by a smidge on still another. Husband is giving me fits about it. He's a guitarist, and he's very, very particular about audio being absolutely in sync. It plays accurately in Hitfilm, and on three of my computers, one running WinPro7, one running Vista, one running Win10. But when he plays the files on his his 8.1 or his Win10, it's just a smidge slow (We're talking unnoticeable to me, but he demonstrated it visually by analog recording it with a cam.) and a smidge fast on his WinPro7. On the other Win7 Home Premium machine and on his old XP machine, it plays accurately to his ear, as does it via his Smartphone. Any ideas?
MORE: Just told husband I posted the query, and he said to mention that in Windows Media player, if you start and stop the video, it gets out of sync...which, I believe is a Win Media Player problem, not the Hitfilm rendered mp4. If he brings up an old Quicktime player, it plays accurately. I also measured the discrepancy and we're talking less than one frame at 30fps.
Is there any way to ensure that, no matter who is playing the files using whatever machine and OS and player, that they get an accurate video synced to audio?